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    <script>
    //   使用for循环 - 求出数组里大于5的i和 [4, 9, 5, 20, 3, 11]
    let arr = [4, 9, 5, 20, 3, 11]
    let sum = 0
    for(let i = 0; i < arr.length; i++) {
        if(arr[i] > 5) {
            sum += arr[i]
        }
    }  
    document.write(`数组里大于5的i和是${sum}`);
    </script>
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